iPhone 5 can't connect to wifi

I am at loose ends trying to find a solution to fix the wifi on my iphone5!! I was connect fine and then all of a sudden it dropped wifi connection (at home) and when I tried to connect again it said "unable to connect to network". I've restarted the network setting a numerous times, I have done a soft reset on my phone and nothing!! There are 5 other iPhones in the house (3G, 3GS, 2x 4g and an 4s) all except the 3G are on the new ios6 and none of those are having issues connecting to the wifi at home.

Someone help or know a solution because at this rate I'm ready to throw the stupid 5 out the window!

I've been having the exact same problem the past couple of months and I finally fixed it today. I really hope this helps. I have an AT&T 2Wire wireless router. My iPad works and connects perfectly with my home wifi but for some reason my iphone keeps getting kicked off and the Apple store actually replaced my iphone because they thought maybe there was something wrong with the internal antenna. The new phone did the exact same thing and then I finally searched for issues on AT&T.net and this is what I found. The underlined area is what I did and it worked. My opinion is that it has to do with your Internet service provider. GOOD LUCK!

Enable iPhone to access a home wireless network and other Wi-Fi networks

To enable your iPhone to access your home wireless network as well as public Wi-Fi networks, you need to join an AT&T Wireless Gateway (2Wire Wi-Fi) network on your iPhone.

The Apple iPhone Wi-Fi settings determine when iPhone uses local Wi-Fi networks to connect to the Internet. If no Wi-Fi networks are available, or you've turned Wi-Fi off, then iPhone connects to the Internet via the AT&T EDGE or Mobile Broadband network.

To connect to your AT&T Wireless Gateway over Wi-Fi with your iPhone, you need to know your 2Wire Wi-Fi network name and security key. The default network name is 2WireNNN, where NNN is the last 3-digits of the serial number of your 2Wire Gateway device. The default password is the 10-digit number located on the bottom of your 2Wire Gateway device.

Configure your iPhone to connect to your 2Wire wireless gateway:

Step 1: Check for iPhone OS updates.

Make sure you have an Internet connection and have installed the latest version of iTunes from the Apple website.

Connect your iPhone to your computer.

In iTunes, select iPhone in the Source pane.

Select the Summary tab.

Select Check for Update.

iTunes will tell you if a newer version of the iPhone OS is available. If necessary, select Update to install the latest version of the iPhone OS.

Step 2: Enable Wi-Fi on your iPhone.

From the Home screen, tap Settings.

Tap Wi-Fi.

Turn Wi-Fi On. The Wi-Fi button will turn blue when Wi-Fi is enabled on your iPhone.

Step 3: Connect to your 2Wire wireless gateway.

When you enable Wi-Fi, iPhone automatically scans for all Wi-Fi networks within range, finds your AT&T Wireless Gateway, and asks if you want to join this wireless network.

Tap Join to connect to your home wireless network.

If your network does not automatically display, or if Ask to Join New Networks is turned off, you must manually join a network to connect to the Internet when neither a previously used network nor the AT&T EDGE network is available.

To connect to your 2Wire Wi-Fi network manually:

From the Home screen, tap Settings.

Tap Wi-Fi.

Tap Choose a Network, then tap your 2Wire wireless network by name. The default network name is 2WireNNN, where the last 3-digits of the serial number of your 2Wire Gateway device.

Enter your 2Wire wireless security key in the Password field. The default password is the 10-digit number located on the bottom of your 2Wire Gateway device.

Tap Join to connect to your home Wi-Fi network.

Your iPhone is now connected to the AT&T wireless network in your home for the fastest Internet browsing and e-mail access.

Thank you soooooo much Cindy0504!!!!! I got my iPhone 5 yesterday and I was going to take it back tomorrow because I've tried so many different things to get it to work. It boggled my mind because my husband and I both got the same phones; his worked and mine didn't. Darn technology...can't live without it now! Thanks again!

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